Update podman_image to specify CPU arch when pulling image (#578)

* Add test to sprcify CPU arch when pulling image

Signed-off-by: nishipy <goodisonev4@gmail.com>

* Update to specify CPU arch when pulling image

Signed-off-by: nishipy <goodisonev4@gmail.com>

* Add document for specifying arch

Signed-off-by: nishipy <goodisonev4@gmail.com>

* Fix for idempotency

Signed-off-by: nishipy <goodisonev4@gmail.com>

* Update plugins/modules/podman_image.py

Signed-off-by: nishipy <goodisonev4@gmail.com>

---------

Signed-off-by: nishipy <goodisonev4@gmail.com>

tests/integration/targets/podman_image/tasks/main.yml

@@ -161,7 +161,7 @@
     - name: Pull image with SHA256 tag
       containers.podman.podman_image:
         executable: "{{ test_executable | default('podman') }}"
-        name: "quay.io/coreos/etcd@{{ sha_image_info.images.0.Digest }}"  #quay.io/coreos/coreos-installer:latest
+        name: "quay.io/coreos/etcd@{{ sha_image_info.images.0.Digest }}" #quay.io/coreos/coreos-installer:latest
         state: present
 
     - name: Create a build directory with a subdirectory
@@ -277,6 +277,45 @@
           - "'Failed to find image bad_image' in bad_push.msg"
           - "'image pull set to False' in bad_push.msg"
 
+    - name: Pull an image for a specific CPU architecture
+      containers.podman.podman_image:
+        executable: "{{ test_executable | default('podman') }}"
+        name: docker.io/library/ubuntu
+        arch: amd64
+      register: pull_arch1
+
+    - name: Pull the same image for the same CPU architecture
+      containers.podman.podman_image:
+        executable: "{{ test_executable | default('podman') }}"
+        name: docker.io/library/ubuntu
+        arch: amd64
+      register: pull_arch2
+
+    - name: Pull the same image but for another CPU architecture
+      containers.podman.podman_image:
+        executable: "{{ test_executable | default('podman') }}"
+        name: docker.io/library/ubuntu
+        arch: arm
+      register: pull_arch3
+
+    - name: Ensure the result of pulling image for another CPU architecture
+      assert:
+        that:
+          - "pull_arch2 is not changed"
+          - "pull_arch3 is changed"
+
+    - name: Get the image info
+      containers.podman.podman_image_info:
+        executable: "{{ test_executable | default('podman') }}"
+        name: docker.io/library/ubuntu
+      register: imageinfo_arch
+
+    - name: Ensure the CPU architecture of the image is as expected
+      assert:
+        that:
+          - item.Architecture == "arm"
+      loop: "{{ imageinfo_arch.images }}"
+
   always:
     - name: Cleanup images
       containers.podman.podman_image:
@@ -284,6 +323,7 @@
         name: "{{ item }}"
         state: absent
       loop:
+        - docker.io/library/ubuntu
         - quay.io/coreos/alpine-sh
         - quay.io/coreos/etcd:v3.3.11
         - localhost/testimage